Type-switching isn't too farfetched an idea in the Pokemon world, but it doesn't occur very commonly. Of course, in hind-sight, Abigail should've known better than to trust a restaurant that guaranteed type-switching with every meal.

It was after she finished her steak and her body began to burble loudly that she realized how the type-switch occurs...

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Art © Da-Fuze
Lucario © Pokemon